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【正文】 it must suit various conditions .Factors influencing the design were not only the size of the parts , but also their bined weight .The Omnipad needed to be held in one hand while the other hand remained free to operate the touch screen and manipulate goods .The of the Omnipad would determine its success. We started the project by drawing internal ponents in Pro/ENGINEER .Compad provided detailed Pro/E NGNEER parts used in its CFcard sleeve design .An initial assembly was used for subsequent configuration proposal . Configurations that passed specifications were printed in real size to serve as a modeling aid for preliminary foam mockups . Eventually one mockup passed the field tests and was used as the basis for the next design phase . The final configuration defined the optimal placement for the ponents . An outer casing tightly packed the ponents , leaving as little space as possible between the ponents and the casing .We started with the Advanced Surface Extension (ASX) module of Pro/ENGNEER 2020i2 , but it soon became clear that to design the bounding surfaces with more freedom , a plete freeform design solution was needed .The dynamic aspect of design and the plex surface transitions (especially in the hand grip area and the transition from sleeve to casing ) required a more flexible and powerful tool. Taking a Test Drive A local reseller offered two solutions : CDRS and ISDX .While CDRS is an industryproven solution for drawing Aclass surfaces ,it is a seperate application that would have forced us to learn to work in an entirely new environment .In addition ,we anticipated that frequently shifting from one application to another , even if well implemented through the 5 ATB , would slow down design process. Coincidentally , a preproduction version of Pro/ENNGNEER 2020 was shipping at the time . This version included a new feature called the style feature . This interactive surface design extension or ISDX arrived just in time . Although still in preproduction ,ISDX had the same stability and roubstness as Pro/ENGNEER Foundation . After a short training period ,Pars pro toto began using ISDX 。用這種方法，一個三角形片被分成四角形（四邊形），這樣 ISDX 就可以創(chuàng)建適當(dāng)?shù)拿媪恕? 因?yàn)?Compad iPAQ 3630 和它的外套聯(lián)結(jié)太緊密，我們使用 proengineer 的幾何復(fù)制特性來增加表面和曲線，這樣能幫助我們在現(xiàn)有基礎(chǔ)上增加新的切面時實(shí)現(xiàn)無縫聯(lián)結(jié)。讓人驚奇的是保證了尺寸和比例
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